I like it, but I'll abstain from voting for now.
"or by means available through current unclassified technology"
The "unclassified" part seems unnecessary.
"SCP-1855 is an area identical to Louisiana Highway 22 and the area around it, continuing on for at least 300 km or indefinitely."
How much of the are around it? If you left the highway and just keep walking/driving away from it what would happen? Would you run into a city? An invisible wall?
"[DATA EXPUNGED] powered clocks do not register as if time were moving forward or backward."
How do we know that this isn't just the clocks not working?
"Things such as freezing temperature or a limited supply of oxygen are extraneous."
Where in this world do you encounter freezing temperatures or a limited supply of oxygen?